Electrostatic condenser



May 4 1926. A1,583,306

w. w. NEVlN-s ET AL ELECTROSTATIC CONDENSER Filed Oct. '7y 1924 "way,

ToRs.

A TTO EY Patented `May 4, 1926.

UNITED STATES PATENT OFFICE.y

WILLIAM W. NEVINS, OF COLLEGE PARK, AND ROBERT L. WALKER, F ATLANTA,GEORGIA, ASSIGNORS TO A. E. HILL MANUFACTURING COMPANY, OF ATLANTA,

GEORGIA.

ELECTROSTATIC CONDENSER.

Appncation sied october 7, 1924. semi No. 742,126.

T0 all whom it may concern Be it known that We, WILLIAM W. NnvrNs andRomair L. WALKER, citizens of the United States, and residents ofCollege On top of this we place alternate sheets of dielectric material14 and sheets of active Inaterial 15, the dielectric material being of adiametertolit justinside the shell and the Park, county of Fulton, andState ofV active"materialhaving-a diameter somewhat Georgia, and ofAtlanta, county of Fulton, and State of Georgia, respectively, haveinvented certain neu7 and useful Improvement-s in ElectrostaticCondensers, of which the following is a specification.

This invention relates to an improved condenser of the fixed capacitytype which has for its object, first, to provide one that Is enabled tomaintain a more constant capacity due to the fact that the assembling ofits elements is accomplished to keep these elements under properpressure throughout the entire surface, and, consequently, there is nochange in the pressure in the structure, and second, that it is one thatpossesses great mechanical strength, is compact and is symmetrical.

The invention is illustrated in the accompanying drawing in which Figurel Is a top view of thecondenser made according to our invention. Figure2 is a side view and Figure 8 an end view of the device shown inFigure 1. Figure 4 is an enlarged cross Vsection of the condenser beforethe top edge ure 5 is a similar View after the top edge has been sorolled. Figure 6 is a section ou line 6-6 in Figure 7 and Figure 7 is aface view of one of the plates provided with an extension to act as aterminal.

The casing of the device is cup-shape, that is, it is cylindrical Withan open top and is provided with the side Walls 10 and thebottom 11, theside walls having gaps 12 which are suitably disposed usually onopposite sides of the casing. This shell is made of metal and acts as acontainer for the plates that go to make up the condenser.

To provide metal that is easily Worked,

the casing 10 is usually made of thin material and while the bottomportion can be made of greater thickness, it is usually more convenientto insert a bot-tom plate 13 of metal which is placed in the bottom ofthe shell and is of substantially the same diame ter as the inside ofthe shell and thus insures proper thickness to provide sutlicicntmechanical strength.

less so that there is no contact or' the side edges of the activematerial with the shell.

The lowermost of the plates 14 can be made of insulating materialinstead of dielectric material and so also With the top plate on whichthe metal plate 16, similar to the plate 13, is placed These assembledparts are then subjected to pressure by suitable tools but preferably bya die so that the top edge 17 of the shell is rolled over as shown at 18in Figure 5. This rolling is ac complished under sullicient pressure t0cause the assembled plates to be rmly pressed together over their entiresurface, the plates 13 and 16 being of sufficient rigidity to insurethis and there can be no displacing of the plates, this being anassurance of no variation in capacity.

The cylindrical or round type of construction permits of this evendistribution of pressure which is not so feasible with small condensershaving a square or rectangular form. Such of the plates 15 ofactivematerial as are to be used as terminals are provided with lips 19 whichproj ppt fout. through which at the same time are used for fastening thesoldering tip 21 thereto. This construction insures the mechanical andelectrical connection between the proper plates to form the terminals.

The device is symmetrical Vin appearance,

is of great mechanical strength, and the edges 17 are assured of acomplete rolling over or contact with the assembled plates in thecondenser by reason of the distortion of metal possible by reason of thegaps in the side Walls of the shell. While the cylindrical form ispreferred, it will be evident that a cup-like casing or various otherforms such as three-cornered or oblong shapes can also bc manufacturedembodying this present construction.

le claim:

1. condenser comprising a cylindrical shell With an open end and gaps inits sido walls, metal plates and plates of dielectric materialalternately placed in said shell, the

shell having rolled edges t0 cause said edges to press on the plates in'the shell to keep the plates under an even distribution of pressure tomaintain a constant capacity.

5 2. A condenser Comprising a Cup-shaped shell, with opposed gaps in itssides, a series of plates in the shell, selected plates having lipsprojecting` thrergh the gaps to provide terminals, the shell having itstop edge rolleel over toluear with pressure on the intents 10 of theshell.

In testimony that We Claim the t0regoing, We have hereto set our hands,this 4th da); of Oct., 1924.

lVILLIAM lV. NEVINS. ROBERT L. lVALKER.

